General - Major Streams of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accounting Policies [Abstract]
Revenue from contracts with customers	$ 121,777	$ 112,238
Alternative revenue programs, net	(1,927)	112
Other balancing and memorandum accounts, net	2,430	1,521
Other regulatory mechanisms, net	666	(430)
Rental income	1,356	1,344
Total revenues	$ 124,302	$ 114,785